diff --git a/spack.yaml b/spack.yaml
index abd3b7c40b91a35a8fd10be8a933befb17610d80..f02fbbd4aabcdb446d8d1b22430a09b746f0224d 100644
--- a/spack.yaml
+++ b/spack.yaml
@@ -1,6 +1,6 @@
 spack:
   specs:
-    - acts@19.1.0 +dd4hep +identification +json +tgeo +ipo +examples +fatras +geant4
+    - acts@19.1.0 +dd4hep +identification +json +tgeo +ipo +examples +fatras +geant4 +python
     - cairo@1.16.0 +fc+ft+X+pdf+gobject
     - clhep@2.4.4.0 cxxstd=17
     - cmake@3.23.1